Here are some interesting Ulpan sites - places you can go to study Hebrew.
Kibbutz Ulpan - current list of Kibbutz Ulpaniym. These are typically 2-6 months in duration, and low cost because you work part of the day at the Kibbutz.
Israel's Ulpan Or - also offers distance learning via telephone and new media.
Ulpan Akiva - short, regular, intensive courses ideal for people with little time. In Netanya, Israel.